Conduit for electric wires.



No. 781,353. PATENTBDJAN.31,.1905.'.

. s. PALMER.

GONDUIT FOR ELECTRIC WIRES.

APPLIGA'TIOR FILED no'v. 1'1, 1993.

I I l/VfE/VTOR- 44 $4M Allorriey UNIT D STATES;

Patented January 31, 1905.

PATENT OFFICE.

STEPHEN PALMER, OF TROY, NEW YORK, ASSIGNOR TO MARCUS M. WATERMAN, JAMESK. P. PINE, JAMES J CHILD, HERBERT E. NORTHRUP, AND GEORGE W. DAW, OFTROY, NEW YORK.

CONDUIT FOR ELECTRIC WIRES.

SPECIFICATION forming part of Letters Patent No. 781,353, dated January31, 1905. Application filed November 17, 1903. Serial No. 181,539.

To all whom, it may concern: I

Be it known that I, STEPHEN PALMER, of

Troy, in the county of Renss'elaer andfState of New York, have inventedcertain new and useful Improvements in Conduits for Electric 'Wires;and-VI do hereby declare the following to be a full, clear, and exactdescription of the invention, suchas will enable others tain novelfeatures of construction and combinations and arrangements of parts, aswill' be more fully hereinafter described, and pointed out in the claim.y

In the accompanying drawings, Figure 1 is a View in cross-section,illustrating my improvements. Fig. 2 is a View in longitudinal section,and Fig. 3 illustrates the inner fabric tube with my improved openbraiding thereon.

1 represents an inner tube of woven fabric fireproofed in any approvedmanner and having an inner coating 2 of refractory materialsuch, forinstance, as asbestos,mica, and the like. The tube 1 is formedfromastrip I curved longitudinally to bring its longitudinal edges together,and while in such position my improved open braiding 3 is located aroundthe same. Awaterproof adhesive material 4:such, for example, asasphaltum-is then applied over open braiding 3, and it will be observedthe braiding 3 not only serves to hold the edges of fabric 1 togetherand the fabric 'in cylindrical form, but also provides a great number ofopenings, into which the adhesive I material 4 (which is applied in aplastic conand it will be understood that the tube can be built up toany desired thickness by applying "alternatelayers of fabric 5 and fireand waterproof material 6 until the desired thickness is produced.

By constructing a conduit as above described a tube of great textilestrength is produced, one which owing primarily to the longitudinaldisposition of the threads of the inner woven fabric 1 cannot stretchlongitudinally. vThe open braiding 3 insures a tube of perfect formationand one in which the several coatings are securely locked into "Theconduit is fireproof, waterproof, and sufficiently flexible to performall the necessary functions of a device of this character.

Slight changes might be made in the general form and arrangement of theseveralparts described without departing from my invention, and henceIdo not restrict myself to the precise details set forth, but considermyself at liberty to make such slight changes and alterations as fairlyfall within the spirit and scope of my invention.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is

As a new article of manufacture, a conduit for electric wires,comprising an inner tube of woven fireproofed'fabric having an innercoating of refractory material, an open braiding inclosing said fabrictube, waterproof adhesive material inclosin g said open braiding andentering the interstices thereof, a closelywoven braided fabricinclosing said adhesive material, and a coating of adhesive materialinclosing said closely-woven braided fabric. In testimony whereof I havesigned this specification in the presence of two subscribing witnesses.

' STEPHEN PALMER. Witnesses:

S. W. FosTER, S. G. NOTTINGHAM.

practically one integral mass.

